The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

CVO GPS Network - WIFC-Wife P.S.
Start: 17-Aug-2004
End: 24-Feb-2008
Lisowski, Michael, 2012, CVO GPS Network - WIFC-Wife P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T58W3BFC